The VLT Advanced Active Filter AAF 006 is from factory optimized for the most common applications. The unit is self tuning and can not be overloaded. If correctly sized, the filter reduces the current harmonic distortion of a system to less then 5%.
The VLT Advanced Harmonic Filter AHF 005 and AHF 010 are advanced harmonic filters not to be compared with traditional harmonic trap filters. The Danfoss harmonic filters have been specially designed to match the Danfoss frequency converters.
du/dt filters are differential-mode low-pass filters which reduce motor terminal phase-tophase peak voltages and reduce the rise time to a level that lowers the stress on the insulation at the motor windings. This is especially an issue at short motor cables.